Display panel or portion thereof with a graphical user interface



FIG. 1 is a front view of a display panel or portion thereof with agraphical user interface showing a first embodiment of our design;

FIG. 2 is a front view of a display panel or portion thereof with agraphical user interface showing a second embodiment thereof;

FIG. 3 is a front view of a display panel or portion thereof with agraphical user interface showing a third embodiment thereof; and,

FIG. 4 is a front view of a display panel or portion thereof with agraphical user interface showing a fourth embodiment thereof.

The outermost broken line rectangle illustrates a display panel orportion thereof that forms no part of the design. The remaining brokenlines, including all text, illustrate portions of the graphical userinterface and form no part of the design.

CLAIM The ornamental design for a display panel or portion thereof witha graphical user interface, as shown and described.